Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
sum((48/50)^(i-1) * (2/50) * sum((49/50)^(j-i-1)* (1/50),j=i+1 to 22),i=1 to 21)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random